NOTES AND MEMORANDA. 
Foreign Microscopes.—Hartnack is back at work in Paris, 
just as he was before the war. He is about to establish works 
at Potsdam. 
Death of Professor Schweigger-Seidel—It is with profound 
regret that we record the death of this skilful histologist, 
who has been for some months despaired of. He was histo- 
logical assistant to Professor Ludwig in the Physiological 
Institute at Leipzig, and was there much regarded for his 
personal qualities, as well as valued for his efficient services 
in the laboratory. Phthisis was the cause of his death. He 
was reporter on histology in Virchow’s Jahresbericht, and 
proved himself therein an able critic. His chief works are 
on the structure of the kidney and on the plasmatic channels 
and the corpuscles of the cornea. 
The Muscular Fibre of the Pharynx of Gasteropods.—We 
recorded in July Mr. Dall’s paper on this subject, without 
mentioning that he is in error in supposing that his observa- 
tion is in any way new. Besides many older papers, there 
are those of Schwalbe and of Boll in Schultze’s Archiv, in 
which a long account of such striated fibres is given. 
At the meeting of the British Association (see also 
‘ Pfluger’s Archiv’ for 1871), Mr. Ray Lankester announced 
the existence of Hemoglobin in the muscular fibres of the 
pharynx of Gasteropods, though it is entirely wanting in 
their blood. The physiological importance of this observa- 
tion (as to the function of Hemoglobin) is obvious. 
A New Book on Hemoglobin.—Professor Preyer, of Jena, 
has just published a very elaborate and assuredly, most useful 
book on the ‘ Blood-crystals.’ It contains all that can be 
said about them, both crystallographically, zoologically, phy- 
siologically, physically, chemically, and historically. ‘Two 
most beautiful plates of a vast number of absorption spectra 
are given, besides one of various blood-crystals. The book is 
indispensable to those who are working at the absorption 
spectra of blood and blood-derivatives. This part of the 
