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PROCEEDINGS OF THE SOCIETY. 
Meeting of 17th June, 1891, at 20, Hanover Square, W., 
the President (Dr. K. Biiaithwaite, F.L.S.) in the Chair. 
The Minutes of the meeting of 20th May last were read and 
confirmed, and were signed by the President. 
The List of Donations (exclusive of exchanges and reprints) received 
since the last meeting was submitted, and the thanks of the Society given 
to the donors. 
From 
De Toni, J. B., Sylloge Algarum, vol. i. pts. 1 and 2. (8vo, 
Patavii, 1889) The Author. 
Parker, T. J., Lessons in Elementary Biology, pp. xxii. and 
408, text illust. (8vo, London, 1891) The Author. 
Monograph of the Palseontographieal Society, vol. xliv. . . \ M p r . 
Report of the British Association, 1890 j r. . p, 
A series of figures illustrative of Geometrical Optics. Re- 
duced from F. Engel and K. Schellbach. By W. B. 
Hopkins. Text, pp. iv. and 56; atlas, 13 pis. (Svo and 
fol., Cambridge, 1851) Mr. J. Mayall, junr. 
A slide containing Tubercle Bacilli Dr. G. H. F. Nuttall. 
Woodhead, G. S., Bacteria and their products, pp. xiii. and"! The Publisher (i/r. 
459, text illust. (8vo, London, 1891) / W. Scott). 
Slides (4) of Artemia fertilis, and (1) of desert sand from the 
Great Salt Lake, Utah Dr. J. E. Talmage. 
Photographs (2) of Diatoms Mr. B. W. Thomas. 
The President called attention to the volumes presented by Dr. J. 
B. de Toni as being the commencement of a most important work upon 
the marine algm. The portion now before them contained one section 
only — the green seaweeds, every known species of which was fully 
described. The other two great sections, the red and the brown 
varieties, would be afterwards dealt with, and the whole, when com- 
pleted, would form the most valuable work of reference on the subject 
yet contemplated. 
Prof. F. Jeffrey Bell referred to the book, ‘ Lessons in Elementary 
Biology,’ presented by Prof. Jeffery Parker, of Otago, N.Z., as one 
likely to be of interest, an extract from the preface being read to show 
the aim of the author in seeking to assist the amateur microscopist as 
well as the professional student. 
Mr. J. Mayall, junr., said he had much pleasure in presenting to 
the Society a copy of the English edition of Engel and Schellbach’s 
optical diagrams, together with an explanatory volume by Mr. W. B. 
Hopkins, which he thought would prove of use to those who were giving 
attention to the passage of pencils of light through various forms of 
lenses. The original work was a recognized text-book in Germany and 
other parts of the Continent ; but it had become very scarce and expen- 
sive. The English edition did not differ essentially from the original, 
though the diagrams were reduced in size, and in some cases, where the 
