NOTES AND MEMORANDA. 23 



nine years. His memoirs, begim in 1857, have been issued with re- 

 markable rapidity. His principal works consist of his monographs 

 on the Infusoria and Annelids. In all his papers, his thorough physi- 

 ological and anatomical training is percei:)tible, his details being always 

 discussed in all their general bearing. Living in Geneva, and a pupil 

 of Johannes Miiller, he wrote with equal facility French and German : 

 an admirable draughtsman, his many papers, which have appeared 

 in the principal German and French scientific periodicals, are excel- 

 lently illustrated and wonderfully accurate. His qualities as an ori- 

 ginal and independent observer are best seen in his larger memoir on 

 the Annelids of the Gulf of Naples, and his observations on the 

 Anatomy and Embryology of the Invertebrates made on the coast of 

 Normandy. His style was remarkably clear and his information very 

 extensive, as is shown fi'om his scientific reviews in the Archives de 

 Geneve. Thoroughly independent in his scientific opinions, he never 

 allowed himself to be carried away by weight of authority, and no 

 scientific charlatan protected by eminent names was allowed to pass 

 current ; his reviews and criticisms were often sharp, but always just, 

 and never personal. The Academy of Geneva, where he was Professor 

 of Anatomy, will find it difficult to fill the place of one who, in spite 

 of his failing health, showed an enthusiasm for his science rarely 

 equalled. 



On two new Lamps for the Microscope. — These lamps, con- 

 structed by Mr. E. Eichards, F.E.M.S., are designed for the purpose 

 of those who are in the habit of taking their microscopes with them 

 to their friends. The following description will make clear their 

 Ijroperties. One is intended to bm-n benzoline, the other parafinc. 

 The receptacles are both of same size : the former is filled with a 

 sponge, saturated and drained off in the usual way, and will burn for 

 three hours ; the other is filled likewise with j^arafine, and will bxu'n 

 for six hours. The stand gives a height of 12 inches, and weighs only 

 6 oz., and is arranged as follows : — Half of the stem screws into the 

 burner of the lamp, thereby preventing any escape of the liquid or 

 spirit ; the other half screws through the bottom of the stand — ■ 

 forming a short pendulum in appearance — convenient for carriage. 

 The lamp is enclosed in a neat case for the pocket. These lamps 

 were exhibited at the last meeting of the Eoyal Microscopical Society, 

 and gave great satisfaction. 



Col. Horsley's Cylinder for Oblique Illumination.— The cylinder 

 is li inch long, and l;j inch in diameter, made of brass tube silvered 

 inside. The light is thrown on to it either directly, or fi-om prism or 

 bull's-eye used as a prism. A dark ground is easily got with low 

 angle ^-inch, and without trouble or loss of time (so say several 

 witnesses) the hemispheres of Angulatum are shown very beautifully. 

 The first apparatus was made by silvering the inside of the tube of 

 the sub-stage which carried the polarizer ; this was done by rubbing 

 on it a solution of nitrate of silver, to which hyposulph of soda had 

 been added. This silvers brass with a good surface, and moderately 

 permanent, in a moment. — [This note was received fi-om Dr. J. Miller, 

 V.P.E.M.S.j , 



