State Microscopical Society of Illinois · Chicago, Ill. : State Microscopical Society of Illinois · leaf 50
h of an inch. The exterior pores, in each pair, are so crowded towards the extremity of their respective plates, ^ ^ ^, . •^ . Oligoporus Groveri. Showing that they fall nearly, or quite, in the position of pores on ambuiacrai same line, while the inner ones present two more scattered lines of dots… … THE DIATOMACEJB. OF LAKE ML CHI G AN. The city of Chicago derives its water-supply from Lake Michi-gan, which washes its eastern front. Commencing on the lakeshore at a point about three-quarters of a mile north of the mouth ofthe Chicago river, which is a nearly stagnant stream, reeking withthe…
Microscopy
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