lOQO OYSTERS, AND ALL ABOUT THEM. 



he could well conceive that when the spat had been pro- 

 duced in enclosed pares great mortality was observed, so 

 that no real results were obtained ; it was to a great extent 

 caused by the water not containing enough oxygen. He 

 had been occupied to some extent with embryological 

 researches on various marine animals, and he had found 

 that if he only took care that a fair supply of oxygen were 

 pumped into the water, he could develop many marine 

 forms of animal life, and keep them healthy for a period 

 of eight weeks and longer, in no greater space than a large 

 tumbler, without ever changing the water. With regard 

 to temperature, it had always been observed that it was 

 necessary for the water to be 68 or 70 in order to get a 

 large number of spat on the tiles. 



Are the advocates of the climatic theory satisfied ? 

 If not, I can produce more unanswerable authorities in 

 proof of my argument ; but I think, for the present, the 

 foregoing will suffice. Taking the sufficiency for granted, 

 I will, before " summing up," reply to a statement made 

 by one of my " witnesses," in an extract from Mobius. 



What, Mobius again ? 



Certainly ; why not ? I would quote as frequently 

 from any other writer were he a Mobius. When an author is 

 good, a little license in frequency of quotation is surely 

 allowable, and especially so in a work of this class, wherein 

 antagonistic theories and conflicting opinions have to be 

 clashed together, in order to show the reader both sides of 

 the question, and to make him familiar with all matters 

 relative and of interest to, the subject ; so that if, after 

 perusal, should he, in doubt as to who is right or who is 

 wrong, be prompted to exclaim 



" Who shall decide when Doctors disagree ?" 



