Tue MICROSCOPE. 271 
The advisability of giving the annual exhibition during the 
ensuing month was discussed, and the matter was referred to a 
committee. 
SEPTEMBER 22, 1886. 
The committee appointed at the last meeting to examine into 
the advisability of holding the annual reception next month, 
reported strongly in favor of the proposition, and after some dis- 
cussion it was unanimously decided to hold the reception on the 
16th prox., provided a suitable hall could be obtained for that date. 
From present indications there is scarcely a doubt that as regards 
the number of exhibitors, the number of microscopes used and the 
variety and beauty. of the objects shown, the coming exhibition will 
be the best ever held on this coast. 
Pursuant to announcement Dr. Stallard delivered a brief ad- 
dress on ‘‘ Endarteritis,” or morbid development and subsequent 
degeneration of the interior coat of arteries. The structure of the 
three layers of tissue of which arteries are composed was described 
in detail. The interior coat, it was explained, was most liable to 
become morbidly affected. When the blood is forced through an 
artery at an abnormal velocity the interior layer manifests a dis- 
position to resist the increased pressure by thickening, and should 
the pressure be of long continuance it frequently results in the 
formation of a tissue lining the interior of the artery which, con- 
stantly increasing in thickness, obstructs the flow of blood through 
the vessel more and more, until in many cases the artery is com- 
pletely closed. This morbid growth is frequently traversed by 
pseudo-blood-vessels, but ultimately becomes completely disorgan- 
ized, usually by fatty degeneration. During the complete or partial 
obliteration of an artery, nature usually attempts to remedy the 
evil by a greater flow of blood through the adjacent smaller blood- 
vessels, and under the unusual pressure these frequently burst. 
Dr. Stallard then exhibited a very large number of prepara- 
tions showing arteries in their normal condition, as well as during 
the gradual progress of the disease. Some twenty fine microscopes 
were used for this purpose. The preparations were stained with 
various re-agents and were much admired for their beauty and 
interest. The subject was further illustrated by a large number of 
photographs and drawings, all well executed. 
The Secretary exhibited a slide of the beautiful diatom Arach- 
