haversian spaces-spaces in bone formed by the enlargement of haversian canals. haversian system-a central canal containing capillaries and the concentric osseous lamellae around it occurring in compact bone.
Any donation to a political party, campaign, or action committee is non-deductible. Other non-deductible contributions are those to individual people, labor unions, business associations, for-profit schools, for-profit hospitals, foreign governments, and fees paid to associations or state or municipal governments.
Charitable contributions are tax deductible in most cases. When a person donates a charitable good and gets a receipt, he can easily write the donation off on his taxes. Volunteer work of any sort, even senior volunteer work, may not be tax deducible. Community service occupies a gray area in the tax code.