ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 253 



(5) Microscopical Optics and Manipulation. 



Milne, J. R. — New form of Spectrophotometer. 



[Paper describing the developed form of the instrument, the 

 principle of which was indicated in a previous communi- 

 cation.] 



Proc. Roy. Soc. Edinburgh, xxv. (1905) pp. 338-54. 



M „ New form of Juxtapositor, to bring into accurate contact the 



edges of the two beams of light used in Spectrophotometry with 

 an application to Polarimetry. 



Tom, cit, pp. 355-63 (3 figs.). 



(6) Miscellaneous. 



Linnseus and the Use of the Microscope. — Mr. Frank Crisp 

 has kindly forwarded the following letter and extract for insertion in 

 the Journal : — 



Perhaps it might be worthy of a note in the Journal to call attention 

 to the fact that Linnaeus used a Microscope. I had never heard that 

 he did, but at a Meeting of the Linnaean Society not long since the 

 President, Professor S. H. Vines, F.R.S. D.Sc, mentioned the fact, and 

 I asked him for the authority, which he has sent me as per enclosed 

 manuscript. 



Cuff's name has been spun out in the Latin. I should have thought 

 that Cuffianus would have been sufficient. Possibly they thought his 

 name was Cuffin. 



Memorandum as to the Use of Microscope by Linnceus. 



Amcenitates academics, vii., Dissertation cxlvi., Mundus Invisibilis 

 (Roos, 1767), p. 399. Speaking of the Smut of Wheat (Ustilago) the 

 author says : — 



" Perhibet Auctor, pulvere hoc aquae immisso et sestivo calore per 

 aliquot dies exposito, vera ovis excludi animalcula. Experimentum 

 hoc iteratum vidimus apud N. D. Praes (i.e. Linnaeus) ubi microscopio 

 Cuffiniano haec (nudo alioqum oculo invisibilia) ad multas vidi 

 myriades." 



Translation. — The author asserts that when this powder has been 

 mixed with water, and exposed for some days to summer heat, true 

 animalcules are given off by the ova. We have seen this experiment 

 repeated in the presence of our Mr. President, where, with a Cuffinian 

 Microscope, I have seen them — i.e. the animalcules— (though they are 

 invisible with the naked eye) in many myriads.— S. H. V. 



Method of Constructing small Glass Tanks.* — T. G. Kingsford 

 describes the following simple method of constructing glass tanks 

 suitable for aquaria and for light filters/f" 



The construction is simple and within the range of the amateur 

 mechanic. It consists of 2 glass disks for the sides, a band of thin 



* Journ. Quekett Micr. Club, ix. (1904) pp. 117-20 (2 figs.), 

 t See this Journal, 1904, pp. 383 and 479. 



