506 



prepare suitable resolutions to express the regret of the 

 members of the Society at the loss. The Committee con- 

 sists of Dr. LeConte, Mr. Lesley and Dr. Carson. • 



Mr. Ilolman exhibited, by request of the members, his 

 new method for observing the circulation of the blood, by 

 throwing upon a screen a lime-light image of one water- 

 animal after another, enclosed between two glasses. Cavities 

 are ground out of the glass-slides, of a size and shape to tit 

 the animal's body, restrain its movements and permit the 

 transparent tissue to be focussed on the screen. To protect 

 the creature from the heat a simple apparatus, of india- 

 rubber tubes, permits a constant current of cold water to 

 pass around the subject between the glasses. 



On motion of Mr. Walter the thanks of the Society were 

 tendered to Mr. Ilolman for the very interesting exhibition 

 with which he had obliged the Society. 



Mr. Blake presented to the Society, in the name of the 

 Swedish Commission at Vienna, a copy of a work entitled 

 " Results of an experimental inquiry into the mechanical 

 properties of steel, &c , manufactured by Christian Aspelin, 

 Esq., Westanfors and Fagersta Works, Sweden," by David 

 Kirkaldy ; illustrated by plates. London : Testing and Ex- 

 perimental Works, Southwark St., S. E., 1873. 



lie described KirkaMy's magnificent exhibition in the 

 building at Vienna, and directed the members' attention 

 specially to the distorted circles and squares (engraved on 

 annealed and unannealed steel plates) after tension, proving 

 visibly the universal distribution of the strain and conse- 

 quent movement of molecules throughout the mass of steel. 

 He thought that an important conclusion might be drawn 

 from this by the physicist discussing such questions in 

 geology as that of the elongation of pebbles in conglomerate 

 rocks. 



A discussion took place among the members present, par- 



