...only to produce fruit. F. vary to a considerable extent in size. The individual plants are at first too small to be seen without the aid of a microscope, and while some remain microscopic, many species attain a diameter of several inches or even of several...

...we begin to realize what an immense number of nerves there must be. And when we consider that they are too small to be seen without the aid of a microscope, and that most of these minute fibers leads direct to the brain, we realize still more fully, how very delicate...

...without the aid of the microscope and are in fact so small that they cannot be separated by means of sieves. In testing the texture of a clay it is perhaps of sufficient importance for practical work to determine the percentage of any sample that will pass through a sieve of 100 or 150 meshes...

...without the aid of the microscope and are in fact so small that they cannot be separated by means of sieves. In testing the texture of a clay it is perhaps of sufficient importance for practical work to determine the percentage of any sample that will pass through a sieve of 100 or 150 meshes...

...without the aid of the microscope and are in fact so small that they cannot be separated by means of sieves. In testing the texture of a clay it is perhaps of sufficient importance for practical work to determine the percentage of any sample that will pass through a sieve of 100 or 150 meshes...

...without the aid of the microscope and are in fact so small that they cannot be separated by means of sieves. In testing the texture of a clay it is perhaps of sufficient importance for practical work to determine the percentage of any sample that will pass through a sieve of 100 or 150 meshes...

...tiny littlfe creatures called spermatozoa—one is a spermatozoon. Here is a picture of some. They are too small to be seen without the aid of a microscope. They are about 1-500 of an inch long, that is, 500 of them laid end to end, would cover only an inch...

...fluid state into small, solid pieces like threads when a blood vessel is cut. These little threads are too small to be seen without the aid of a microscope, but nevertheless they are present, and they tangle up the very small blood cells until finally a dam...

...sand-grains of sufficient size to be visible to the naked eye, but the majority of the particles in clay are too small to be seen without the aid of a microscope,...it becomes impossible to separate them with sieves. Mechanical analysis. — In determining the texture of a clay, various methods of separation may be...

...sufficient to make an accurate identification if the mushroom in hand is in this book. Most fungous spores are too small to be seen without the aid of a microscope; for the species we discuss they are mostly in the range of 3-30 ^im in length and consist of a single...