134 THE AMERICAN MONTHLY [May, 



The performances of these high powers speak for themselves. 

 Tlie l-75th was never before used in micro-photography of any 

 kind before the writer and Dr. Harriman, used them. Still the 

 1-lOth inch 4 system objective answers for ordinary purposes. 



Even the 1 2d class Tolles objective performed well. So 

 that those having low power objectives should iry to use them 

 thus. The modifications of the Woodward process do not de- 

 tract from their high value and reputation. 



It was the writer's aim to have an apjiaratus which mi/ht be 

 exhibited in practical operation to societies of medical gentle- 

 men at their places of meeting. This aim has been realized in 

 a measure. 



The procedures emi)loyed in taking the photic illustrations 

 required : 



1. The patient to be present. 



2. The operator and assistants. 



3. The camera. 



4. Sun Light. 



5. Microscope. 



6. Condenser. 



7. Mirror or Heliostat. 



1, The Patient to be Present. — Generally it was necessary 

 to have the patient present because it was found that taking 

 the blood from the patient and carrying it a mile or two to the 

 photographer's saloon, caused the appearances to lose their dis- 

 tinct, well marked characters. The sooner the pictures are 

 taken the better the result. This element of the patient's pres- 

 ence was one great difficulty in the way. It was found, at first, 

 no easy matter to have the patient and the other re^juisites all 

 make a conjunction together of time and place. Most of the il- 

 lustrations were taken at Tewksbury (Mass ) State Alms-house 

 and also at the U. S. Naval Hospital, Chelsea, Mass. 



2. The Operator. — To do this work assistance was found 

 necessary. This the writer received from G. B. Harriinan, 

 D. D. S., of Boston, who attended to the adjustment of the light, 

 microscope and slides. The high power objectives used were 

 (1877,) his property, the writer selected and collected the speci- 

 mens, watched the camera plate and focussed some of them. 

 J. W. Black & Co., Boston, furnished the dark room man ; a pro- 

 fessional in every case. This was Woodward's recommenda- 



