. The Canadian field-naturalist. Natural history. The Ottawa Naturalist [April. Fig twinned according to different twinning laws gives rise to the formation of very complex groups. The measurements were made by the two- circle goniometer; the measured values of ip and p compared with the calculated ones taken from Goldschmidt's Winkeltabellen for the following parameters are given below. a?c = : 1 Face. f 0 Meas- Calcu- Meas- Calcu- ured. lated. ured. lated. 001 __ 0° 0° 010 0° 0° 90° 90° 100 89° 58' 90° 90° 90° 110 58° 39' 58° 37' 90° 90° 130 28° 36' 28° 39' 90° 90° 012 0° 0° 19
. The Canadian field-naturalist. Natural history. The Ottawa Naturalist [April. Fig twinned according to different twinning laws gives rise to the formation of very complex groups. The measurements were made by the two- circle goniometer; the measured values of ip and p compared with the calculated ones taken from Goldschmidt's Winkeltabellen for the following parameters are given below. a?c = : 1 Face. f 0 Meas- Calcu- Meas- Calcu- ured. lated. ured. lated. 001 __ 0° 0° 010 0° 0° 90° 90° 100 89° 58' 90° 90° 90° 110 58° 39' 58° 37' 90° 90° 130 28° 36' 28° 39' 90° 90° 012 0° 0° 19° 54' 19° 52' Oil 0° 0° 35° 53' 35° 52' 021 0° 0° 55° 20' 55° 20' 052 0° 0° 61° 3' 61° 3' 031 0° 0° 65° 16' 65° 15' 041 0° 0° 71°' 70° 55' 092 0° 0° 73° 10' 72° 55' 051 0° 0° 74° 32' 74° 32' 061 0° 0° 77° 77° 1' 071 0° 0° 78° 49' 78° 49' 081 0° 0° 79° 45' 80° 11' 091 0° 0° 81° 2' 81° 16' 0° 0° 81° 57' 82° 7' 0° 0° 83° 25' 83° 26' 102 90° 90° 30° 38' 30° 39' 111 58° 39' 58° 37' 54° 16' 54° 14' 112 58° 39' 58° 37' 34° 42' 34° 46' NOTES. The American Musium of Natural History, we learn from its Journal, has offered to the National War Work Council of the Young Men's Christian Association the choice of any of its thousands of miscellaneous lantern slides which may be found suitable for the entertainment of soldiers in camp, either in this country or abroad. A cable received from France by the War Work Council asked for as many colored slides as possible, with a range of subjects embracing architecture, art, science, war and the scenery of various countries. The museum is preparing also a series of lectures to be circulated among the camps. Four of these now in course of preparation are: "Hunting Elephants and Other Big Game in Africa," by Carl E. Akeley; "Whale Hunting with Gun and Camera," by Roy C. Andrews; "Down the River of Doubt with Colonel Roosevelt,&q
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