1885.] Enter ochlorophy 11 and Allied Pigments. 319 



n'=[ir— — v dG r . 



J Q (l+^W^Vl-^Sm^ 



This is not exactly the form considered by Jacobi, but if we write 



S- — 1 = ^ n ^° Z (uq) and n=—-k 2 sn 2 u bis result is equivalent to 

 K dn^ 



Connected with is a second function of the form 



P' 



This satisfies the relations 



r 1 («+2iK')=r 1 («) 



?i(»+2K)-f 1 ( 



&(«) i 



and I find tbat it can be expressed in terms of $(u) by means of the 

 equation g 1 (u)=-^—log ^ u ^ rU °^ , where u is the same constant as- 

 above. 



It thus appears that Q(u) and <&(u) are connected with and sup- 

 plement each other in a very remarkable manner. 



jFor example, if we write £(u) and £i(u) in the more convenient 

 forms %(u, u ), ^(w, u ), it follows that besides Jacobi's result, 

 w o£( w > w o) =w £( M o> M )> we naYe likewise the equivalent form m 5i(m, « ) 



II. 44 Further Observations on Enterochlorophyll and Allied 

 Pigments." By C. A. MaoMunn, M.A., M.D. Communi- 

 cated by Professor M. Foster, Sec. R.S. Received April 

 21, 1885. 



(Abstract.) 



In a paper read before the Royal Society in 1883, I described the 

 results of an examination of the so-called "bile " of invertebrates, and 

 showed that the alcohol extracts of their liver or other appendage of 

 the intestine answering to that organ, showed a spectrum so like 

 that of vegetable chlorophyll, as to have led me to assume that no- 

 essential difference exists between the spectrum of enterochlorophyll 

 and plant chlorophyll. 



