THE point raised by Mr. Cumming in last week's NATURE (vol. xxxvii. p. 584), as to the use of the words density and specific gravity is, it seems to me, of some importance. For many years past I have, ...

The purpose of this paper is to determine the extent to which the physical and mechanical properties of dry and green wood samples are correlated. Samples of green (fresh) sap- and heartwood differing ...

The Indian Ocean Geoid Low ranks as the largest negative "gravity hole" anomaly on Earth, which is why the “thumbprint” jumps ...

The area of Earth with the lowest relative gravity is located just south of India in the Indian Ocean. This gravity “hole” may be due to low-density plumes of magma disturbed by the sinking slabs of a ...

A urine-specific gravity test compares the density of urine with the density of water. The test may help healthcare professionals identify dehydration, a kidney problem, or a condition like diabetes ...

We assessed the combined effects of varying the relative density and the relative floral morphological complexity of plant species on the behaviour of their bumblebee pollinators. Three species of ...