76 Scientific Intelligence. [J An'. 



The total weight of the concretions in the state in which Mr. 

 Children received them was about 4^ ounces ; the largest weigh- 

 ing 1036 grains, and the smallest about 611 grains. The specific 

 gravity of the largest was 1*875. 



100 parts yielded, by analysis, animal 



matter, chiefly gelatine 25*2 



Resin 39 



Ammoniaco-magnesian phosphate . .. 5*16 



Phosphate of Imie 45*34 



Vegetable fibre 20*3 



99-9 



The vegetable fibre appeared to be derived from the oatmeal 

 which forms a considerable proportion of the food of the labour- 

 ing class in Lancashire. 



On the same day, a paper was read, by Dr. Wollaston, on the 

 Adjustment of Chromatic Object Glasses. 



At the same meeting, a paper was read, by SirEverard Home, 

 on a new Species of Rhinoceros found in the Interior of Africa. 



Article XVI. 



SCIENTIFIC INTELLlGliNCE, AND NOTICES OF SUBJECTS 

 CONNECTED WITH SCIENCE. 



I. Comet. 



The Sydney^ or Netv South Wales Gazette of April 7, mentions a 

 beautiful comet at that period visible in the hemisphere. It formed 

 a triangle to ♦the south-west, with the west shoulder of Orion and 

 Aldebaran. 



II. Plymouth Breakivater. 



M. Dupin furnishes a very curious estimate of the number of per- 

 sons employed on this chef-d'oeuvre of naval architecture, and the 

 quantity of stone sunk by each individual. On contrasting this with 

 the parallel works at Cherburgh, it appears that three persons at Ply- 

 mouth were enabled to accomplish as much as four at the latter 

 place, in the same period of time. 



III. Ventilation of Rooms. 



Mr. Perkins lias suggested an improved mode of ventilating arid 

 warming rooms. It consists in introducing a column of cold air im- 

 mediately at the back of the stove, and by this means, a large portion 

 of the heat usually wasted or misapplied, is equally diffused over the 

 room. The greater the quantity of air which is made to strike against 

 and pass by the stove, the greater is the quantity of heat given out 

 by it. It will not, however, work to good advantage when the room 



