Here’s what a 1921 cookbook had to say about how to substitute various sweets for sugar in recipes:
As substitutes for sugar for cooking purposes, corn sirup, molasses, glucose, maple sugar and sirup, and also honey come in for their share of usefulness. The question arises in the mind of many a housewife as to how much of these diluted sugars should be substituted in customary recipes. For this reason, the following facts may be of interest.
Corn sirup and maple sirup are not so sweet as sugar, and when used to replace it, should be increased from one half to two thirds. For instance, if a recipe calls for 1 cup of sugar, use as substitute 1 1/2 to 1/2/3 cups of sirup. In this case, allowance must be made for the increase in liquid. Every cup of sirup furnishes 1/4 cup of liquid; there for every cup of sirup that is substituted for sugar, reduce the original amount of liquid in the recipe 1/4 cup. Unless such allowance is made for the liquid that the sirup adds, an extra amount of flour is needed to obtain the necessary thickness to the batter, and a poor product is likely to result.
In using molasses and brown sugar, no change need to be made so far as amounts for sweetening purposes are concerned, because what these lack in sweetness is largely made up in flavor. However, the same allowance must be made for the liquid as when sirup is used. Glucose is best when used with part sugar, say 1/3 sugar to 2/3 glucose by measure. When used thus, it is suitable for canning purposes, also for making of sauces, etc.
Honey, one of the most staple sweetenings in the world, and probably the longest used, as not been in very common use for cooking purposes. Its sweetening power is about the same as that of sugar, and it should be used in the same proportions as white sugar, except that one fourth less of liquid should be used in a recipe with honey than with sugar. Honey is best adapted for table use; and for this purpose, it had better replace white sugar entirely.
The Science of Food and Cookery (1921) by H. S. Anderson
The substitution amounts probably haven’t changed across the years – but the spelling has. “Sirup” is now often spelled “syrup,” and “sweetenings” are now “sweeteners.” There sugar substitution recommendations in the old cookbook for both “corn sirup” and “glucose.” I’ve always thought that corn syrup and glucose were the same thing, but apparently they are different.
A Hundred Years Ago 
I wonder if ‘glucose’ isn’t akin to what I fill the hummingbird feeders with: a simple sugar and water mixture.
Some simple common sense advice!
I wonder if dentists agree that honey is the better table product, given its stickiness. It is certainly tastier.
I thought that corn syrup was these days considered spawn of the devil, given that it promotes appetite and obesity even more than its cousin, sugar. I suppose commoner advice these days would simply be to cut down on sweetness. Nowadays, I routinely cut down on sugar or whatever by about a third when making cakes and biscuits.
I have a large Costco bottle of honey that I want to use as a substitute, so I’m glad this article (even though it is 100 years old!) discussed using it! I do not care for the taste or the health effects of artificial sweetners – such things would never have even been dreamed of in 1921!
So many sugar substitutes are now available beyond the ones mentioned! I rarely use a substitute for sugar…