SUPPLEMENT. I 26 I 



One day, thinking over the matter, I decided upon 

 trying to open the oyster from the opposite side of the 

 shell, and I found that, by placing the flat part of the 

 oyster downwards, I could readily insert the point of an 

 ordinary oyster knife between the hinge, and thus open it 

 with the greatest ease. 



I likewise found no difficulty in instructing my cook 

 to open them in the same manner. 



I am. Sir, your obedient servant, 



E. A. V. 

 September 24. 



CHEMICAL ANALYSIS OF SEA-WATER. 



Although I have given several analytical computations 

 of sea-water, I regret that the following Tables were not at 

 my command for earlier insertion, in order to form an 

 appropriate conparison with those already presented to the 

 reader. 



It is also a matter of sincere regret to me that Pro- 

 fessor Issel's (a} valuable and interesting volume on oyster 

 culture (from which these Tables are taken) did not reach 

 me until almost the final sheets of this book were going to 

 press, else I would have been only too pleased to have 

 made quotations from a practical work which only needs a 

 translator to prove its instructive merit. The paginal 

 excess of my book, however, has precluded the pleasure of 

 quoting thence, which I will certainly avail myself of in a 



(a) Istruzioni Pratiche per L'Ostricoltura e La Mitilicoltura, 

 dettate da Arturo Issel, per commissione del Ministero D'Agricoltura, 

 Industria e Commercio. (Geneva, Tipografia del R. I. Sordo-Muti, 

 1882.) 



