ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 455 



used on board the 'Beagle,' and which was recommended to me by 

 E. Brown, that I cannot forego the mere chance of advantage of urging 

 this on you. The leading point of difference consists simply in having 

 the stage for saucers very large and fixed — mine will hold a saticer three 

 inches in inside diameter. I have never seen such a Microscope as mine, 

 though Chevalier's (from whose plan many points of mine are taken), of 

 Paris, approaches it pretty closely. I fully appreciate the utter absurdity 

 of my giving you advice about means of dissecting; but I have appre- 

 ciated myself the enormous disadvantage of having worked with a bad 

 instrument, though thought a few years since the best. Please to observe 

 that, without you call especial attention to this point, those ignorant of 

 natural history will be sure to get one of the fiddling instruments sold 

 in shops. If you thought fit, I would point out the differences which, 

 from my experience, make a useful Mici-oscope for the kind of dissection, 

 of the invertebrates, which a person would be likely to attempt on board 

 a vessel. But pray again believe that I feel the absurdity of this letter, 

 and I write merely from the chance of yourself possessing great skill 

 and having worked with good instruments, may not possibly be fully 

 aware what an astonishing difference the kind of Microscope makes 

 for those who have not been trained in skill for dissection under 

 water. . . . 



Ever, my dear Owen, 



Yours sincerely, 



G. Daewin. 



P.S. — If I do not hear, I shall understand that my letter is super- 

 fluous. Smith and Beck were so pleased with the simple Microscope 

 they made for me, that they have made another as a model. If you 

 are consulted by any young naturalists, do recommend them to look at 

 this ; I really feel quite a personal gratitude to this form of Microscope 

 and quite a hatred to my old one." 



[Addressed] "Professor Owen, Eoyal College of Surgeons, Lincoln- 

 Inu-Fields, London." 



BosTOCK, E. — Tlie Presidential Address [to the Postal Microscopical Society]. 



Journ. of Microscopy, II. (1889) pp. 1-8. 

 Detmees, H. J. — American and European Microscopes. 



[" Referring to the reports of his address which appeared last September, 

 Dr. Detmers says,, in contradiction, that he did not take Microscopes, 

 objectives, or accessories to Europe; that he did not make a test of skill 

 ■with the Germans ; that he did not pliotograph objects in competition witli 

 them; and, in short, that no such fighting of objectives as was described 

 occurred."] 



AiTier. Mon. Micr. Journ., X. (1889) pp. 5B-5. 

 Hitchcock, R. —The making of Apochromatics. 

 [Account of a visit to Jena.] 



Amer. Mon. Micr. Journ., X. (1889) pp. 49-53 (1 pi. and 3 figs.). 

 International Competition in Microscopy. 



Amer. Mon. Micr. Journ., X. (1889) pp. 70-1. 

 [Ma N TON, W. P., and others.] — Microscopical Outfit for Physicians' use. 



The Microscope, IX. (1889) pp. 83-4. 

 Zeiss, C. P.— [Obituary Notice and Portrait.] 



Central. -Zig. f. Opiik u. Mech., X. (1889) pp. 85-7 (portrait). 



2 I 2 



