Vegetarians also frequently stay with non-vegetarian friends, or lodge with others who do not understand how to provide for them. For such this book will especially prove useful, for in it will be found a set of thirty menus, one for each day in a month, giving suitable recipes with quantities for one person only. Throughout this book it will be found that the use of wholemeal has been introduced in the place of white flour. Those persons who do not care to follow the hygienic principle in its entirety can easily substitute white flour if preferred. The recipes have been written bearing in mind the necessity for a wholesome diet; and they will be found to be less rich than those in most of the cookery books published. Should any one wish to make the dishes richer, it can easily be done by an addition of butter, eggs, or cream. Let me draw the attention of vegetarians to the use of soaked sago in many dishes. This is a farinaceous food which should be used much more largely in vegetarian cookery than it is. Thoroughly soaked sago should be used in all dishes, savouries or sweets, in which a substitute for suet is required to lighten the mixture; that is, in boiled savouries or sweets which are largely made of wholemeal, as, for instance, in vegetable haggis, roly-poly pudding, and all fruit or vegetable puddings which are boiled in a paste. When soaked sago is used (taking a teacupful of dry sago to two breakfastcupfuls of meal) a light paste will be obtained which would mislead any meat eater into the belief that suet or, at any rate, baking powder had been used. Baking powder, tartaric acid, soda and bicarbonate of soda, are all most injurious to the system, and these chemicals have been left out of this book entirely. In breads and cakes I have used a small quantity of yeast for the rising of the dough; those who once have got accustomed to the use of yeast will not find it any more trouble than using baking powder. It may here be beneficial to give a few hints as to the harm done by the use of the most commonly introduced chemicals, namely, soda, bicarbonate of soda, baking powder, tartaric acid, and citric acid. Not only do they delay the digestion of the foods in which they are used, and give rise to various stomach troubles, but also cause rheumatism and gout, and often are the primary cause of stone in the kidney and bladder. Another danger lies in the fact that these chemicals are too dear to be supplied pure to the public, which always demands cheap goods, and the result is that many of the chemicals in the market are mixed with other still worse poisons, like arsenic, for instance. Self-raising flour, which is liked by so many on account of its convenience, is nothing but ordinary flour mixed with some sort of baking powder; in the same way egg powders are simply starch powders, coloured and flavoured, mixed with baking powder. Tartaric acid and citric acid also belong to the class of injurious chemicals.