1880.] 



MICROSCOPICAL JOURNAL. 



97 



assume to rank amon^ the most 

 valuable scientific periodicals of the 

 day, we believe that the amount of 

 really, practical information, adapt- 

 ed to the wants of amateur micro- 

 scopists, or to more advanced stu- 

 dents, who wish to keep themselves 

 informed about the latest methods 

 of mounting, preparing and exam- 

 ining objects, will prove to be much 

 larger, at the end of the year, than 

 can be found in any other periodical 

 devoted to microscopy. Students 

 of medicine and practicing physi- 

 cians will find much that is valua- 

 ble and useful to them in their 

 profession. 



It cannot be denied that much 

 of the success of the Journal is 

 due to those opticians and dealers 

 in microscopes, who have encour- 

 aged the undertaking from its in- 

 ception, and have spoken well of it 

 to their customers. 



The promptness and liberality 

 with which they responded to our 

 calls for advertisements, before the 

 Journal had any assured circula- 

 tion, indicated no little confidence 

 in the representations of the Pub- 

 lisher, which he is pleased to ac- 

 knowledge in this manner. 



In return, he would request sub- 

 scribers to look over the advertising- 

 pages regularly, and to take note of 

 those who advertise in the Journal. 

 The enterprise and business energy 

 which is shown by the opticians 

 who avail themselves of the columns 

 of a new periodical to advertise 

 their goods, certainly should secure 

 them the patronage of the sub- 

 scribers to that paper. 



Subscribers may be assured that 

 none but responsible and reliable 

 dealers will be permitted to adver- 

 tise in this Journal. 



— In our notice of the Hayden 

 trial, we referred to an error of 



Professor White, who, in the course 

 of a preliminary examination, mis- 

 took some sposes of an alga for 

 blood-corpuscles. Professor White 

 has written to us that, if the facts 

 had been more fuUy stated, his 

 evidence would place him in quite 

 a different light. It appears that a 

 very insufficient time was allowed 

 him for the examination. In his 

 letter, he writes : " From one of 

 those spots (on a stone) when moist- 

 ened, I obtained bi-concave discs, 

 having an average diameter of about 

 ^oT of an inch. These, on the 

 first examination, I believed to be 

 blood-discs, and, having been hur- 

 ried before the Justice, to testify 

 on the preliminary examination, I 

 gave the opinion that those bi- 

 concave discs were blood, and that 

 they correspond in size with blood- 

 discs," etc. " At the same time, I 

 stated to the court that my examina- 

 tion was not complete, that the ex- 

 aminations were to be repeated, and 

 extended by applying chemical tests, 

 testing by the spectroscope, and by- 

 attempting to obtain blood-crystals.'' 

 As we stated, Professor White cor- 

 rected his error afterwards. 



— Judging from the letters which 

 frequently reach us, from sub- 

 scribers who advertise objects in 

 the exchange-column, we are led to 

 believe that our little Journal has 

 given a new impulse to the custom 

 of exchanging slides and material. 

 The benefit of such exchanges is 

 very great, and can be made even 

 greater if exchangers will endeavor 

 to send out only good preparations. 

 Many of our best mounters do not 

 offer their slides for exchange, be- 

 cause experience has taught them 

 that they are not likely to receive 

 an equivalent value in return. A 

 slide may be good, and valuable if 

 the object has been prepared with. 



