Vol. 4 No. 3 (1969)

. Insect population has been subjected to several environmental factors. Included within this environmental category are the type of food, the place to live in, the climatic conditions, etc. This study has been leading to seek of key factor in the regulation of several insect populations. First, the population of APHIS GOSSYPII on cotton plants. It is apparent that the physiological condition of the leaves is the primary regulating factor. Secondly, the size of the population depends also on the food from which the energy came. Corn meal supported large population of TRIBOLIUM CASTANEUM,…

. Among geologic features, which do not indicate phenomena claimed by textbooks, are triangular facet developed on steeply inclined dipslopes, sensation of coarseness that does indicate the sense of fault displacement, and orientation of long pebble-axes perpendicular to transport direction, examples of these features are demonstrated.Ichtisar. Penulis telah mendjumpai beberapa gedjala geologi jang mempunjai arti berlainan dari pada jang biasa dikemukakan oleh "tectbooks"; antara lain ditemukan facet-facet segitiga jang terbentuk pada dipslope tjuram, kesan kasar sepandjang slickendside jang…

. A spectrocospic survey in an area of 5 squares degrees, located in the general direction of the Palomar-Groningen Variable-Star Field 2, yields 263 Giant M stars. A test of completeness shows than the survey was complete down visual magnitude 16 for early giant M stars and to visual magnitude 17 for late giant M stars. The space density distribution of the stars is presented.Ichtisar. Survey setjara spektroskopis bintang raksasa M, didaerah seluas 5 deradjat persegi, kearah Palomar-Groningen Variable-Star Field no. 2, menghasilkan 263 bintang2 raksasa kelas M. Sebuah test statistic…