144 



coloration. Formic acid alone gave some coloration, but it was not so vivid 

 as when ammonia was added. He had tried the experiment with a number 

 of different plants ; all gave some change, but none equal to the vine. 



The President inquired if he had tried the green leaf of the Virginian 

 Creeper. 



Dr. Ralph replied that the cells in the leaf had come to a perfect state, 

 and they would not respond. It was the early sap which was charged with 

 something that gave the colour. If a thin section of the mid-rib of the 

 Creeper were used the same appearance would be obtained. The action of 

 the hydrocyanic acid on the tissues seemed to point to some action on the 

 iron. 



Mr. J. W. Groves, referring to the trouble often experienced in cleaning 

 dirty slides, said that he did not care to use vitrol or other strong acids. He had 

 tried Hudson's extract of soap, which hurt nothing, and cleaned the slides to 

 perfection. If the slides were put into a solution of the extract, and left 

 for a few days, the balsam, cement, and everything else would clean off 

 beautifully. 



The President announced the excursions and meetings for the ensuing 

 month, and the meeting closed with the usual Conversazione, when the 

 following objects were exhibited : — 

 Eggshell of Crocodile ... 

 Trichodactylus osmice, Bee-acarns 

 Bacillus of Tuberculosis (from sputum 

 from human lung), showing the 

 beaded structure with extreme clearness 

 Transverse Stria3 on Amphipleura pellu- 

 cida, mounted dry on cover, shown by 

 accurately centred Achromatic Con- 

 denser without slot or stop 

 These objects were exhibited under a new 

 l-2oth inch oil immersion objective, 

 N.A. 1-38 (130° balsam angle) by 

 Messrs. Powell and Lealandj 



Winged petiole of Citrus aurantium, show- 

 ing essential oil glands, &c. 

 Section of petiole of Drosera rotundifolia . 



Mr. F. W. Andrew. 

 Mr. H. E. Freeman. 



- Mr. E. M. Nelson. 



} 



Mr. J. W. Reed. 

 Mr. F. Wood. 



Attendance— Members, 54 ; Visitors, 5. 



July 14th, 1882. — Conversational Meeting. 



The President. 



The following objects were exhibited : — 

 Marine Annelid (sp. ?) ... 

 Skin of Scyllium stellare ... ... ,, 



Collections of Plant Sections ... ... Mr. T. Curties. 



Phthirius — Two projections provided with \ \r . u y Round 



Hairs 



I Mi 



