PETROLOGY: IDDINGS AND MORLEY 
105 
This is Mendelian inheritance though somewhat compHcated by the 
fact that every ontogeny has its beginnings in the preceding generation. 
Therefore, the conclusion which I recently expressed (Conklin 1916) 
viz. that polarity, symmetry and- pattern of egg organization are non- 
MendeHan characters, is not justified. 
Somewhat similar phenomena have been described by McCracken 
(1909); and Toyama (1913) in silk worms and by several authors (Locke, 
Castle, et al) in the seed characters of maize, wheat, etc. McCracken 
found that when two races of the silk worm are crossed one of which 
produces one brood a year (univoltin) and the other two (bi vol tin), 
the Fi offspring are all like their mother and in the F2 generation "the 
broods fail to follow both parents in the expected proportions. There- 
fore," she concludes, ''the Mendelian law does not hold in this case.'* 
Castle (1910) has criticised this conclusion and has explained these re- 
sults on the ground that voltinism is inherited through the egg and that 
univoltinism is a Mendelian dominant to bivoltinism. Toyama (1913) 
has described in detail the mode of inheritance of several egg characters 
of silk worms and has shown that whereas these seem to be non-Men- 
delian they are in reality Mendelian, "the cause of disturbance of the 
proper order being due to the fact of maternal inheritance, in which pa- 
ternal characteristics remain dormant, even though dominant in the 
egg stage." 
Brachet, A., Arch. hiol. Paris-Brusselles, 26, 1911, (337-364). 
Castle, W. E., /. Exp. ZooL, 8, 1910, (185-192). 
Conklin, E. G., Anat. Anz., Jena, 23, 1903, (577-588); Science, New York, 27, 1908, 
(89-99); Heredity and Environment, 2d Ed., Princeton, 1916. 
Crampton, H. E., Ann. N. Y. Acad. Sci., 1894, (167-169). 
Hertwig, O., Zelle und Gewebe, Jena, 1892, (1-296). 
Kofoid, C. A., Boston, Proc. Amer. Acad. Arts. Sci., 29, 1894. 
McCracken, I., /. Exp. ZooL, 7, 1909, (747-764). 
Toyama, K., /. Genetics, 2, 1913, (351-405). 
A CONTRIBUTION TO THE PETROGRAPHY OF THE ISLAND OF 
BAWEAN, NETHERLANDS INDIES 
By J. P. Iddings and E. W. Morley 
BRINKLOW, MARYLAND. AND WEST HARTFORD. CONNECTICUT 
Communicated, December 21, 1916 
The mountainous island of Bawean, between Java and Borneo, was 
formerly a group of volcanoes, now extinct and considerably eroded. 
It is about 9 miles in diameter, and the highest peaks are 2000 feet above 
the sea. The original form of the cones and craters has disappeared, 
