Feb. 24, 1888.] 



SCIENTIFIC NKWS. 



171 



alluded to above. They are starving because a certain 

 proportion of their food passes through them without 

 contributing to nutrition. 



The reader may have observed that the adjective 

 " untrained " is printed in italics. I have good reason for 

 this, as it points to the " lastly," or practical application 

 of this long sermon, which is that the organs secreting 

 animal diastase may, like the other organs of the body, 

 be strengthened by exercise. Dogs, and even purely 



Therefore, any man or woman [may become a vege- 

 tarian with the aid of a little training, by passing 

 gradually from one diet to the other, or if my theory is 

 correct, it may be done at once with the aid of vegetable 

 diastase, by eating malted bread which is now to be 

 bought, or by adding extract of malt, or malt flour, to 

 their porridge and other farinaceous food. But I must 

 now stop, and may hereafter go into particulars on 

 methods of such admixture. 



PATENT- 

 GREENHOUSE- 

 BOILER 





carnivorous cats, may, by gradual training, become able 

 to digest bread and biscuits. Horses, and even sheep 

 and oxen, may be trained to eat flesh meat and enjoy it. 

 Among the friends of my youth was a sheep reared by 

 a butcher, in Jermyn Street, that preferred raw mutton 

 chops to fresh grass. Pigs, whom, as Blumenbach 

 showed, we more nearly resemble than any other 

 quadrupeds, may be reared upon purely vegetable diet, 

 or, as in too many piggeries around London, upon the 

 offal from butchers' shops, slaughter-houses, etc. They 

 specially enjoj' rats and ducklings. 



GAS-HEATED CIRCULATING BOILER.] 



ORDINARY lighting gas is an] expensive fuel com- 

 pared with coal or coke, unless great care is taken 

 to use it with the best appliances for recovering as 

 much as possible of the heat produced on combustion. 

 The economical heating of water by means of gas is 

 especially difficult as the water contained in the vessel to 

 be heated is necessarily at a low temperature compared 

 with that of the gas flame, and it the latter impinges on 

 the vessel, there is more or less incomplete combustion 



