Here are some quick tips on how to distinguish classic crystal from plain glass. 1  Hold up a glass to the light. 2  If the glass acts as a prism and you see a rainbow you are holding crystal. 3  If not, it is just plain glass. 4  When struck, crystal produces a musical ring. 5  Glass does not.
Hormonal control of menstrual cycle. The ovarian hormones circulate in the blood and are excreted in modified forms in the urine. Estimation of the urinary output by chemical methods gives an indication of the blood levels and of the total production of these substances.
The hormone that controls a woman's monthly cycle, estrogen, gets a lot of attention in women's lives, but it is actually a hormone that affects both men and women. Here's what you need to know about estrogen and the way it can affect you.he hormone that controls a woman's monthly cycle, estrogen, gets a lot of attention in women's lives, but it is actually a hormone that affects both men and women. Here's what you need to know about estrogen and the way it can affect you.