^Juuml^AlXTlSI] PROCEEDINGS OF SOCIETIES. 261 
The Manchester Lower Mosley Street Natural History 
Society.* Microscopic Section. 
Minutes of ]\leetmg, 22nd July, 1869. Mr. Chaffers, President, 
in the chair. — In accordance with the resolution passed at the last 
meeting, each member brought slides of the Griclcet or Cockroach. 
Mr. Aylward, Gizzard of Gochroacli ; Head of ditto, dissected ; 
Head, Gizzard, Section of Gizzard, Oviposiler, Spiracles, Trachece, 
Tongue and Eggs of Cricket. 
Mr. Jackson, Legi and Wing Case of Cricket, Antennce of Dytiscus. 
Mr. Chaffers, Gizzard of Cricket, two slides ; Legs and Abdomen of 
Cockroach. 
Mr. Nash, Elytra and Antennce of Cricket. 
Mr. Armstrong, Two Cockroaches, mounted entire; Head and Legs 
of ditto ; and Gizzard of Cricket. 
Mr. H. Hyde, Leg of Cricket. 
Mr. Wilmot, Gizzard of Cockroach. 
The evening was spent in examining the various S23ecimens, most 
of which were very well mounted. 
Minutes of Meeting, 8th March, 1869. Mr. Chaffers, President, 
in the chair. — A variety of unmounted objects were distributed amongst 
the members. 
Mr. Armstrong, showing four mounted slides of a very brilliant 
Beetle (name unknown), viz. the Head, Elytra, Skin, and Wing. 
The following contributions were made to the Society's cabinet : — 
Mr. Armstrong, Elytra of Beetle. 
Mr. Jackson, Spores of Lastrcea filix-mas. 
Mr. Hope, Wing of White Plume Moth. 
Mr. Armstrong presented two large photographs to the Society, 
Pleurosigma formosum and Parasite of Field Mouse. 
It was agreed that at the next meeting, 22nd inst., each member 
should bring a mounted slide or slides of the Spider or House Fly, 
with observations upon them. 
Mr. Armstrong read a very comprehensive and instructive paper 
upon the microscope and the various objects open to the study of 
microscopists, which he illustrated with a large number of photographs 
of microscopic objects. He stated, There are three essential conditions 
of efficiency in a microscope : 1st, sufficient visual magnitude ; 2nd, 
sufficient distinctness of delineation ; 3rd, sufficient illumination ; 
gave a lucid description of the three essentials ; and quoted various 
appropriate passages from different authors, descriptive of micro- 
scopic pursuits, and how innumerable are the objects suitable for 
the microscopist. He quoted and instanced the Volvox Glohator ; 
Animalculce of various kinds ; Water Insects and Beetles ; Parasites from 
Animals, Birds, and Insects ; Acari ; Spiders ; dissections of Insects 
and Plants, instancing the various transformations of insect life, 
showing how interesting is the life history of any of our common 
insects ; naming also for the more advanced microscopist the various 
* Eeport furnished by the Secietury. 
